Modification of TiO2 surface for improved light fastness

International Journal of Industrial Chemistry

دوره 6، شماره 3، آذر 2015، صفحه 133-141

نوع مقاله: research article

شناسه دیجیتال (DOI): https://doi.org/10.1007/s40090-015-0044-x

نویسندگان

John George^* ؛ V. S. Gireesh؛ Georgee Ninan؛ S. Krishnan Nair

R&D Department, The Kerala Minerals and Metals Limited, Sankaramangalam, Chavara, Kollam, Kerala, 691583, India

چکیده

Introduction
Rutile TiO₂ dioxide particles were modified with P₂O₅ treatment for improving its UV light fastness and the characteristics are studied using different techniques. The investigation aimed at improving the light fastness of the TiO₂ particles by surface modification with P₂O₅ and optimizing its content for best performance. The coating of different inorganic oxides such as SiO₂, Al₂O₃, P₂O₅, etc. were confirmed by atomic absorption spectroscopy. Microscopic evaluation was employed to evaluate the surface morphology of modified TiO₂. The specific surface area was estimated using BET method. Effect of the surface modification with oxides on electrokinetic properties and zeta potential is appraised. Changes in the pigmentary properties on UV exposure are determined as a measure of light fastness.
Results
The light fastness of the modified samples is superior to commercial TiO₂ pigments. The dispersion and pigmentary characteristics of the P₂O₅ modified samples have approached the commercial rutile TiO₂ pigment standards. The reducing strength values indicate good dispersion characteristics of the P₂O₅ modified samples.
Conclusion
The light fastness of TiO₂ particles can be improved considerably on imparting the coating of P₂O₅ along with Al₂O₃.

کلیدواژه‌ها

Light fastness؛ Zeta potential؛ Reducing strength؛ UV light